Background: Dissection of right and left upper limbs and demonstration of the origin and the course of median nerve. Result: Median nerve in the right upper limb is formed normally but it supplies brachialis muscle and both head of the biceps in the arm which is anomalous. In the left arm of the patient the course and supply of median nerve is normal. Conclusion: The patient has unilateral anomalous supply of median nerve in the arm – this can result in trauma to this nerve while undergoing any surgery in right arm.KEY WORDS: Median nerve, Brachialis muscle, Both head of the biceps brachii, Pronator teres.

Nakatani T, Tanaka S, Mizukami S. Absence of the musculocutaneous nerve with innervation of coracobrachialis, biceps brachii, brachialis and the lateral border of the forearm by branches from the lateral cord of the brachial plexus. J Anat 1997;191(3):459–460.